Experimental method for determining starting pressure gradient of seepage

A technology of starting pressure gradient and experimental method, which is applied in the direction of measuring device, permeability/surface area analysis, suspension and porous material analysis, etc., which can solve the problem of long experimental period, inaccurate data collection, and reduce the uncertainty of data analysis results and other problems, to achieve the effect of simple experimental process

Active Publication Date: 2019-04-02
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

The principles of these seepage experiment methods are usually based on the steady-state seepage model and the unsteady-state seepage model; however, the seepage experiment process takes a long time to reach a steady state, and under the current technical conditions, the data in the seepage section with low differential flow rate cannot be accurate collect

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  • Experimental method for determining starting pressure gradient of seepage
  • Experimental method for determining starting pressure gradient of seepage
  • Experimental method for determining starting pressure gradient of seepage

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[0115] The specifications of the rock core 4 used in the seepage experiment are: the diameter d is 2.5 cm, and the length L of the rock core 4 is 50 cm. Carry out the seepage experiment of the water in the rock core according to the specific implementation steps of a kind of measurement seepage initiation pressure gradient experimental method described in the present invention, such as figure 1 shown. If through the seepage experiment, the displacement pump 1 under the action of two different constant water flow rates Q 1 = 0.001mL / min and Q 2 = 0.004mL / min The data of the pressure change over time at the inlet end of the core holder 5 that continuously injects the rock core 4 and the water is continuously injected into the rock core 4 from the inlet end of the core holder 5 until the pressure at the outlet end of the core holder 5 changes Duration data. The data corresponding to different constant flow rates Q can be respectively fitted by analyzing the pressure change dat...

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Abstract

The invention provides an experimental method for determining initiation pressure gradient of seepage, and belongs to the technical field of oil and gas field development and test. The method comprises the following steps of: first, placing a rock core saturated with homogeneous liquid into a rock core holder, and exerting confining pressure to the rock core; then injecting the homogeneous liquidinto the rock core from the inlet end of the rock core holder; measuring changing data of pressure at the inlet end of the rock core holder over time; monitoring changing data of pressure at the outlet end of the rock core holder over time; stopping the experiment when the pressure at the outlet end of the core holder changes; recording duration time during which the pressure of the homogeneous liquid from the inlet end of the core holder into the core to the outlet end of the core holder changes; and repeating the steps to obtain starting pressure gradient of the homogeneous liquid seeping inthe rock core. The method is simple and rapid, and is more in line with the technical requirements of effective utilization range estimation of oilfield blocks in low-permeability reservoirs and heavy oil reservoir development technologies, and corresponding well network optimization and oil and gas well incentive measures.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development tests, in particular to an experimental method for measuring seepage initiation pressure gradient. Background technique [0002] Seepage in low-permeability porous media does not follow the traditional Darcy's law, and the relationship between seepage velocity and pressure gradient is no longer linear, but there is a "threshold pressure gradient". Oil and gas seepage in tight oil and gas reservoirs (shale oil and gas, low permeability oil and gas reservoirs), pore seepage in aquitards caused by ground subsidence caused by groundwater exploitation, and seepage in the process of cohesive soil consolidation all belong to this type of non-Darcy seepage problems. . The start-up pressure gradient of seepage in low-permeability porous media can be attributed to: ① the pores of low-permeability porous media are small, the pore surface area is large, and the interface between the roc...

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Application Information

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IPC IPC(8): G01N15/08
CPCG01N15/0826
Inventor 刘文超
Owner UNIV OF SCI & TECH BEIJING
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